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Weird Reverse Polarity Indication

TonyG13TonyG13 Member Posts: 1,286 ✭✭✭✭
edited May 2021 in Electrical Discussions
Been going back and forth to the boat all winter. Plug into shore power upon arrival to charge batteries. All has been good.

Launching on Wednesday, so when I was at the boat last Friday yard owner said OK to keep it plugged in to have batteries charged for launch.

When I got to boat today, house battery was dead and main breaker in engine compartment for the house battery was tripped. Checked shore power and showed charger working. Reset breaker and looks like it is charging fine.

Now the weird part - I was looking at the cabin electrical panel and when I flipped the switch for "Panel Lights" on the DC (lower) panel the Reverse Polarity light/indicator came on and it lights it up on the Air Conditioning circuit which isn't even plugged in. I flipped every other switch on both panels and it's the only one that lights up Reverse Polarity.

I've flipped that switch many times in the past and never had this happen.

Any ideas?


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